1. one 20GP can load about 12-14 pieces 1.0m3 or 1.2m3 buckets for 20ton excavator;2. one 40HC can load about 26-28 pieces 1.0m3 or 1.2m3 buckets for 20ton excavator;3. one 20GP can load about 8 pieces 1.6m3 buckets for 30ton excavator;4. one 40HC can load about 16 pieces 1.6m3 buckets for 30ton excavator.